This title appears in the Scientific Report : 2018

##### On the Production of an Isotensor Dibaryon in the $pp \to pp\pi^+\pi^-$ Reaction
Personal Name(s): Adlarson, P. (Corresponding author) / / / / / / / / / Clement, H. (Corresponding author) / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / Zentralinstitut für Elektronik; ZEA-2 IKP- Technische und Administrative Infrastruktur; IKP-TA Kernphysikalische Großgeräte; IKP-4 Experimentelle Hadrondynamik; IKP-2 Experimentelle Hadronstruktur; IKP-1 2018 Preprint Cosmic Matter in the Laboratory Get full text OpenAccess OpenAccess Publikationsportal JuSER
Please use the identifier: http://hdl.handle.net/2128/19892 in citations.
 Exclusive measurements of the quasi-free $pp \to pp\pi^+\pi^-$ reaction have been performed by means of $pd$ collisions at $T_p$ = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $T_p = 1.08 - 1.36$ GeV ($\sqrt s$ = 2.35 - 2.46 GeV), which includes the regions of $N^*(1440)$ and $\Delta(1232)\Delta(1232)$ resonance excitations. Calculations describing these excitations by $t$-channel meson exchange are at variance with experimental differential cross sections and underpredict substantially the measured total cross section. An isotensor $\Delta N$ dibaryon resonance with $I(J^P) = 2(1^+)$ produced associatedly with a pion is able to overcome these deficiencies. Such a dibaryon was predicted by Dyson and Xuong and more recently calculated by Gal and Garcilazo.